Drilling-jig.



C. H. LINDSTEDT.

DRILLING JIG.

APPLICATION FILED APR.2, 1912.

1,064,75 1 Patented June 17, 1913.

III! 7 COLUMBIA PLANDGRAPH c0.. WASHINGTON, D. c.

UNITED STATES PATENT CFFICE.

CARL H. LINDSTEDT, OF HOTCHKISSVILLE, CONNECTICUT.

DRILLING-JIG.

are fully set forth in the following specification.

This invention relates to improvements in devices of that class quite generally availed of for drilling purposes, and particularly for drilling pivot-openings in the shanks of blades for use in so-called pocket-knives, such devices being commonly known as drilling jigs.

The object of this invention is to provide a drilling jig of the character above indicated, which shall be simple and comparatively inexpensive as regards construction, durable, efficient and reliable in practical service, adjustable in a manner to insure marked accuracy in the application of the device to practical purposes, and which shall possess certain well-defined advantages over prior analogous constructions.

The invention consists in the combinations, details and parts whereby, together with the novel disposition and relative arrangement of said parts, the attainment of the foregoing object is rendered practicable, all of which will be hereinafter more specifically referred to and set forth in the appended claims.

The invention is clearly illustrated in the accompanying drawings, wherein similar referencenumerals denote like p arts throughout the several views, as to which:

Figure l is a plan view of a drilling embodying my said improvements. Fig. 2 is a front elevation of same. Fig. 3 is a rear elevation thereof. Fig. 4 is a side elevation thereof, the near stanchion and shaftsupporting pivot carried thereby, being broken away. Fig. 5 is a detail View, showing in perspective and detached the jawtrunnions with the jaw-controlling spring in readiness to be applied thereto.

In order to facilitate the final assemblage of the blade and handle of a so-called pocketknife, in the manufacture thereof, it is essential that the pivot-opening formed in the shank of such'blade, be accurately primarily positioned relatively to the distance between the axis of the pivot on which said blade operates, when the same and the han- Specification of Letters Patent.

Application filed April 2, 1912.

Patented June 17, 1913.

Serial No. 687,977.

dle of the knife are assembled, and the adjacent face of the spring-back of. said knife. ()themvise, and as is now quite universally the case, said spring-back, when the blade is closed, wholly opened, or, as in some instances partially opened, will sag more or less within, or protrude more or less from, the shell of the handle of said knife, which contingencies are objectionable, since either thereof necessitates needless operations in the way of reshaping, as by the process of grinding, the shank of said blade, before the same and said handle may be finally assembled, and the desired symmetry of the knife, as a finished article, secured.

My present invention overcomes the foregoing objectionable contingencies; and in carrying out the same, reference being had to the accompanying drawings, I make use of a bolster or base 2, recessed midway its length, at its underside, for the accommodation of a U-shaped spring 3, whose opposite members project rearwardly of the bed 2, and. elastically impinge, respectively, against the opposite trunnions 2 2". These trunnions extend upwardly through the bed 2, each by way of, and for rotative action in, an appropriate, vertical opening formed in said bed to this end; and said trunnions carry, at their upper extremities, opposite operatingjaws 3 3", one thereof being carried by each of said trunnions. Said operating-jaws, ac cordingly, operate horizontally in fair proximity to the top of the bed 2, and, under normal conditions, are elastically held open, or each with its forward portion more or less away from the forward portion of the other, under the action of the U-shaped spring 3, against the opposite trunnions 2 2", as hereinbefore alluded to. The jaws 3 3 merge, rearwardly of the trunnions 2 2", the one into a shank 4 and the other into a like shank 4"; and, by preference, the same are provided at their forward extremities the one with a tooth 5 and the other with a like tooth 5".

There is firmly mounted on the bed 2, as by means of the screw 6, a drill-guide, which has a nose 4, provided with a vertical drill-way 5, said nose overlying more or less the field within which operate the forward extremities of the jaws 3 3.

Considering the construction thus far described, it will be noted that jaws 3 3" will undergo, in unison, a closing movement, one relatively toward the other, and, as indicated in dotted lines in Fig. 1, sufiiciently so to grasp and firmly hold between them the shank of a knife-blade, upon the shanks 4 4" being duly separated or spread, in unison, apart, or each relatively away from the other; and if this separation or spreading apart of the shanks 4' 4 be effected, as in common practice, by means of a wedge, or the like, movable only along a determinate, invariable course, the jaws 3' 3", closing accordingly, will always hold between them said shank of a knife-blade in one, invariable position relatively to the drill-way Accordingly, the position of the hole drilled through the shank of the knife-blade under the foregoing conditions, may or may not permit the final adjustment of such knifeblade to the handle with which it is intended to be assembled, and at the same time insure the desired and even requisite symmetry of the completed knife, without grinding, or otherwise more or less reshaping, and possibly repeatedly so, the shank of said knifeblade. Hence, it becomes desirable that provision be made whereby the jaws 3 3" may be caused to close and hold between them the shank of a knife-blade at different points relatively to the drill-way 5, since under such conditions, all the essential accuracy, in the positioning of the pivot-hole to be drilled through the shank of such knife-blade, and hence the avoidance of the needless operation or operations hereinbefore alluded to, may be secured in advance of the assemblage of said knife-blade and the handle with which it is intended to be used; and in this connection I provide a semi-annular wedge 6", firmly mounted on a shaft 6, and projecting into and Working within the space intervening between the shanks 4' 4", the latter being elastically held to a sliding engagement therewith, at the opposite reversed spiral faces thereof, respectively, by the action thereon, indirectly through the medium of the trunnions 2' 2", of the spring 3; and said shaft being rotatably sup ported by and between the pointed end-portions of the bearing-pivots 7' T, which latter project in opposite directions, axially toward and for engagement, as specified, with the shaft aforenamed, through the opposite stanchions 8 8", and having a threaded engagement, each with the stanchion which supports it.

Under the disposition of the parts as above defined, the shaft 6 may be adjusted longitudinally in opposite directions, and hence the wedge 6" laterally in opposite directions, by properly adjusting relatively the bearingpivots 7 7", as will be clearly understood; and these bearing-pivots may be locked under their various relative adjustments in any appropriate manner, as by means of checknuts 9' 9", the latter being carried, one by each of said bearing-pivots and each facing and abutting against the stanchion adjacent thereto, all as clearly illustrated in the drawings. The wedge 6" gradually widens from its forward, narrow end to the heel thereof, at the forward and opposite sides, respectively, of the shaft 6, and traverses, when the parts are adjusted, say, as indicated in Figs. 1 and 4-, the underside and more or less the forward and rear sides of said shaft, the bilateral, or opposite, reversed working faces of said wedge lying, accordingly, each more or less spirally with respect thereto. Hence, when shaft 6 is properly rotated in one direction to bring the narrow end of wedge 6" into the space between the shanks 4 l, the latter, through the medium of the spring 3, as hereinbefore explained, will automatically close, each in the direction of the other, while the jaws 3 3 will correspondingly open, each away from the other; and upon the shaft 6 being properly rotated in the opposite direction, shanks 4 t", by reason of wedge 6" uniformly widening from its forward end to the heel thereof, will be strongly urged apart, while the jaws 3 3 will be correspondingly forced to undergo a closing movement, each in the direction of the other, and for a firm holding grasp, as on the shank of a knife-blade, substantially as indicated in Fig. 1. Hence, said jaws may be promptly opened and thereafter closed by, as in this instance, duly rotating the shaft 6, to and fro, forwardly and rearwardly; and this to and fro movement of said shaft may be effected in any well-known and approved manner, although I purpose providing the same to this end, with a radial leveropening 7 for the reception of one endportion of a suitable operating lever, as 8, which may be availed of by the user in manipulating shaft 6 stated.

Olt \'io-1isly, a plurality of openings, each such as denoted by 7. may be availed of, when found desirable, the same being arranged at suitable intervals apart circumferentially of the shaft (3, substantially as indicated in the drawings.

For variably limiting the extent to which the shank of a knife-blade, of the type herein contemplated, may be inserted endwise between the jaws 3' 3", I provide a flat stop 9, held, as by means of a screw 10, in position for a swinging movement horizontally at the top of the bed 2, said stop merging at its service end into a foot 10, projecting more or less into the plane of the jaws aforenamed, somewhat in'advance thereof, and having at its opposite end a slot-like opening 10, formed concentric to the center of movement thereof. as about the screw 10. The stop 9 having been adjusted, as about the screw 10, to bring the foot 10 to the required position, same may be firmly held under such adjustment, as by means of a fastening-screw 11, when turned fully homeward. said fastening-screw projecting downwardly through the slot-like opening 10, and having a threaded engagement with the bed thereunder.

In practice the stop 9 is adjusted in such a manner that when the shank of a pocketknife blade is adjusted between the jaws 3 3", and firmly grasped thereby, the heel of such blade will abut snugly against the foot .10; and to further brace the forward portion of such blade, when thus adjusted. i provide at the forward edge of the bed 2, a flat slide 11"", which carries. at its upper edge, an upright detent 11, against which impinges the back edge of said knife-blade at the same time that its heel aforenamed l abuts against the foot 10.

The slide 11 is held in place, for a suitable sliding adjustment to and fro latorally along the front edge of the bed 2, by means of the opposite screws 11 11" extending, each through slide 11 by way of a suitable opening formed therein to this end, and for a threaded engagement with the bed 2 in connection with which the same operates, the opening in slide 11" for each of the screws 11 11 approxin'iating the opening 10", though elongated lengthwise of said slide, to permit the action thereof just referred to.

It will be understood that, upon, say, stop being duly positioned and thereafter fastened by in ans of screw 11, and slide 11 being duly positioned and fastened by means f the screws 11. 11, dual bearing-points or points of registry. for determining the required position of the lv'nit'e-blade. with its shank to be drilled, such shank being in serted between the jaws 3 3 and the latter being in readiness to be closed for a holding grasp on said shank. are secured: and the 5 blad being thus accurately positioned. jaws 5', it" may be caused to grasp the shank thereof in the mann r stated. by duly at tnating the wedge t3" as hereinhel'ore e.\'- plained.

The operation of my improved drilling jig will be apparent from the foregoing description thereof: and it will be seen that the same is not. only well adapted for the purposes for which it is intended. but may be modified to a considerable extent. particularly as regards the mediun'i availed of for rotatably supporting the wedge t3". the relative action of either f the ws -3" 3-" with respect to the other. and various minor details of the general constructiom, without departing from the scope of the appended claims.

1 claim:

1. A drilling comprising a bed: nor- 1'nally-se1')arated jaws, operating at the top l of said bed, and adapted to clamp between them the shank of a knife-blade; opposite stanchions rising from said bed; a shaft, rotatably supported by and between said stanchions; and a wedge, the latter more or less encircling and carried by said shaft, and

being adapted to close said jaws upon said shaft being duly rotated.

2. i\, drilling comprising a. bed; normally'separated jaws, operating at the top of said bed. and adapted to clamp between them the shank of a kni'leblade; opposite stanchions rising from said bed; bearingpivots projecting adjustably, one through each of said stanchions and each in the direction of the other; a shaft arranged between and in axial alinement with said bearing-pivots, and pivotably supported thereby; and a wedge, the latter more or less encircling and carried by said shaft, and. upon the latter being duly rotated, adapted to close said jaws.

3. A drilling con'ipii-ising a bed; normally-separated jaws, operating at the top of said bed; means for closing said jaws; a flat stop, having a foot, at one end thereof. projecting suitably into the plane of said jaws in ad 'ance thereof, and an elongated opening at the opposite end thereof, and having an axis of movement between said foot and said opening: and a fasteningscrew, the latter extending downwardly through said opening and having a threaded engagement with said bed, and said opening being formed concentric to the axis of move ment of said stop.

at. A drilling jig comprising a bed; normally separated jaws, operating at the top of said bed and adapted to clamp between them the shank of a ki'iife-blade: means for closing said jaws; and a slide. the latter disposed t'rn'wardly of said bed. adjustable to and fro laterally thereal ng. and having a detent rising therefrom for engagement by t the back edge of a knil wbladc when held by the aws a forenamed.

5. A drilling jig comprising a bed: jaws operating at the top thereof: an elastic element for yieldingly holding said jaws duly separated; a shaft rotatablv disposed above the shanks of said jaws and provided with a lever-opening; and a wedge, the latter carried by said shaft. more or less encircling the same, and operating between the shanks aforenamed of said jaws, for closing the latter. upon the shaft aforenamed being duly rotated.

CARL H. LIXDSTEDT.

\Vitnesses 1 I1. TnAvnRs. FRANK 1V. BEARDSLEY.

Copies of this patent may be obtained for five cents each. by addressing the "Commissioner of Patents Washington. 11.0. 

